直接空気回収（DAC）技術の持続可能性評価：エネルギー・エメルギー・環境の統合分析
Exploring the Sustainability of Direct Air Capture Technologies: An Integrated Analysis from Energy, Emergy and Environmental Perspectives (原題)
Chuwan Xu, Jiahui Yan, Junyao Wang, Ying Chen, Song He, Xiaoya Li, Yawen Zheng, Xuelan Zeng, Libing Lei, Zhipeng Tian
🤖 gxceed AI 要約
日本語
固体吸着（S-DAC）と液体吸収（L-DAC）の2方式について、熱力学モデル・LCA・エメルギー分析を統合した持続可能性評価枠組みを構築。統合指標SCIを提案し、S-DACが0.823でL-DAC（0.759）を上回ることを示した。電源・熱源の選択が性能を大きく左右し、PV＋バイオマス熱のS-DACがSCI 0.907で最高、石炭火力L-DACが0.711で最低となった。
English
The study builds a unified thermodynamic model for solid (S-DAC) and liquid (L-DAC) direct air capture, combining LCA and emergy analysis into a Sustainability Composite Index (SCI). S-DAC scores higher (0.823) than L-DAC (0.759), with trade-offs across indicators. Energy source choice dominates outcomes: PV-powered S-DAC with biomass heat reaches SCI 0.907, while coal-fired L-DAC falls to 0.711.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本はDACを含むCCS/CCUSをGX推進戦略の重点技術に位置づけ、2030年までの社会実装を目指す。本論文の電源・熱源別の持続可能性評価は、国内実証プロジェクトの電源構成選定やカーボンクレジット算定の基礎資料として有用。
In the global GX context
DAC is increasingly central to net-zero pathways and carbon removal markets under Article 6 and voluntary credit schemes. This paper's integrated energy-emergy-LCA framework offers a template for comparing DAC routes beyond simple cost or energy metrics, relevant to CDR certification and disclosure of negative emissions.
👥 読者別の含意
🔬研究者:DACの持続可能性を多指標で比較する統合評価手法（SCI）の設計と限界を学べる。
🏢実務担当者:DAC導入検討時に電源・熱源構成が持続可能性指標に与える影響を把握し、調達判断に活用できる。
🏛政策担当者:DAC実装支援策において、電源構成要件や評価指標の設計に示唆を与える。
📄 Abstract（原文）
Direct air capture (DAC) technology is transitioning from the prototype stage into commercialization, yet its large-scale deployment still faces challenges related to high energy consumption and associated environmental and ecological impacts. In this study, we first develop a unified thermodynamic model for the two mainstream DAC routes, solid adsorption (S-DAC) and liquid absorption (L-DAC). Based on this consistent framework, we then conduct life cycle assessment (LCA) and emergy analysis to jointly construct a systematic sustainability evaluation framework integrating energy, emergy, and LCA methods. The Sustainability Composite Index (SCI) was proposed by integrating key indicators to provide a holistic measure for sustainability assessment across different DAC systems. Results indicate that overall, S-DAC demonstrates superior sustainability with a composite index (SCI) of 0.823, compared to 0.759 for L-DAC, although trade-offs exist across different indicators. Under the baseline scenario S-DAC performs well in emergy transformity (Tr), and second law efficiency, whereas L-DAC excels in energy consumption, net carbon removal efficiency, and total environmental impact. The choice of electricity and heat sources exerts considerable influence on the sustainability performance of both DAC systems. Among the 24 energy source scenarios, the photovoltaic power (PV) S-DAC integrated with biomass heat achieves the highest sustainability with an SCI of 0.907. Conversely, the coal-fired L-DAC system and natural gas-powered integrated solutions exhibit the poorest sustainability, with an SCI of 0.711. Notably, even when clean energy is employed, different systems still involve trade-offs across metrics. These findings underscore that comprehensive sustainability assessment is essential before scaling up DAC technologies.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/en19194712first seen 2026-10-09 04:54:37
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